MQTT Broker: Difference between revisions
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Revision as of 19:16, 10 August 2021
The MQTT Broker is a server that allows publishing and subscribing to MQTT topics.
It's meant for sensors and devices at Protospace to communicate publicly and for fun.
Theory
MQTT is a lightweight, publish-subscribe network protocol that transports messages between devices[1]. It's low power and ideal for microcontrollers hooked up to sensors and devices.
Messages are just strings of text like "hello world" or "12.3".
Messages are sent to arbitrary topics like /pets/dogs/charlie. By convention slashes separate levels of category that we all agree on.
When a message is sent to a topic, all devices that are subscribed to that topic receive the message.
Topics aren't really created, they just exist as soon as a message is sent to them.
Access
Server / host: webhost.protospace.ca
Reading
Anyone can read any topic. Don't send anything private over the broker.
- username: reader
- password: cf503b99ba8cb0103da8884f09694fcd60ba1f2d
Writing
Ask Tanner for write access to the broker. We want to make sure you don't accidentally screw up sensor data.
- username: writer
- password: [ask Tanner]
Technical Info
The MQTT Broker is hosted on the Webhost VPS managed by Tanner. The same one that's running the main Website and the Wiki.